package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;
import java.util.Objects;

@Service
public class DishServiceImpl implements DishService {
    @Autowired
    DishMapper dishMapper;

    @Autowired
    DishFlavorMapper dishFlavorMapper;

    @Autowired
    SetmealDishMapper setmealDishMapper;

    /**
     * 新增菜品，同时插入菜品对应的口味数据
     * @param dto
     */
    @Transactional
    @Override
    public void saveWithFlavor(DishDTO dto) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dto, dish); // 属性名要一致
        // 向菜品表插入1条数据
        dishMapper.insert(dish);

        Long dishId = dish.getId();

        // 向口味表插入n条数据
        List<DishFlavor> flavors = dto.getFlavors();
        flavors.forEach(dishFlavor -> dishFlavor.setDishId(dishId));
        if (!flavors.isEmpty()) {
            dishFlavorMapper.batchInsert(flavors);
        }
    }

    /**
     * 分页查询菜品
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult page(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> dishVOPage = dishMapper.page(dishPageQueryDTO);
        return new PageResult(dishVOPage.getTotal(), dishVOPage.getResult());
    }

    /**
     * 批量删除菜品
     * @param ids
     */
    @Transactional
    @Override
    public void deleteBatch(List<Long> ids) {
        // 判断菜品是否能够删除--受否在售卖，是否与套餐关联
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if (Objects.equals(dish.getStatus(), StatusConstant.ENABLE)) {
                // 处于启售状态，不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        List<Long> idList = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if (!idList.isEmpty()) {
            // 当前分类下有菜品，不能删除
            throw new DeletionNotAllowedException(MessageConstant.CATEGORY_BE_RELATED_BY_DISH);
        }

        // 删除菜品数据
//        for (Long id : ids) {
//            dishMapper.deleteById(id);
//            // 删除菜品关联的口味
//            dishFlavorMapper.deleteByDishId(id);
//        }
        // 改进代码
        dishMapper.deleteBatch(ids);
        dishFlavorMapper.deleteBatch(ids);
    }

    /**
     * 根据id查询菜品和对应口味
     * @param id
     * @return
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        // 根据id查询菜品
        Dish dish = dishMapper.getById(id);

        // 根据菜品id查询口味
        List<DishFlavor> dishFlavorList = dishFlavorMapper.getByDishId(id);

        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavorList);
        return dishVO;
    }

    @Transactional
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        // 修改菜品基本信息
        dishMapper.update(dish);
        // 删除原有的口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());

        // 添加新的口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (!flavors.isEmpty()) {
            flavors.forEach(dishFlavor -> dishFlavor.setDishId(dishDTO.getId()));
            dishFlavorMapper.batchInsert(flavors);
        }
    }

    /**
     * 根据分类id查询菜品数据
     * @param categoryId
     * @return
     */
    @Override
    public List<DishVO> list(Integer categoryId) {
        return dishMapper.getByCategoryId(categoryId);
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    @Override
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }

    @Override
    public void startOrStop(Integer status, Long id) {
        dishMapper.startOrStop(status, id);
    }
}
